Whisk warm water and miso until smooth.
Add soy sauce, rice vinegar, sugar, sesame oil, garlic, scallion, and ginger to a container.
Note: I like to use taller containers because it is easier to fully submerge the eggs without having to add more marinade.
Place peeled medium-boiled eggs in a jar and submerge fully.
**Pat them dry before adding them to the marinade if they are wet on the outside.**
Cover in an airtight container, and refrigerate at least 8 hours or overnight.
These will last for 3-5 days in an airtight container in the fridge if they are medium-boiled eggs.
Hard-boiled eggs can last 5 – 7 eggs since the yolk will not spoil as quickly.